Dissolvable solid article containing preservatives

Abstract

A dissolvable solid article, comprising: water soluble polymer; a surfactant; at least one selected from diaminocarboxylic acid chelants and salts thereof; at least one selected from aromatic carboxylic acids and salts thereof; a phenolic derivative; at least one selected from α, β-unsaturated Aliphatic Carboxylic Acids, salts, and derivatives thereof; at least one selected from non-aromatic organic alpha hydroxy acids and salts thereof; wherein the dissolvable solid article has a pH of from about 3 to about 5.5 when dissolved with 20 parts water to 1 part of the dissolvable solid article. The present invention provides dissolvable solid articles which provide preservative efficacy even after dissolution of the articles, while controlling the concentrations of preservative ingredients in the solid articles.

What is claimed is: 
     
       1. A dissolvable solid article, comprising by weight of the article;
 a. from about 10% to about 30% of a water soluble polymer comprising polyvinyl alcohol; 
 b. from about 35% to about 65% of a surfactant system comprising sodium lauryl sulfate and sodium laureth sulfate; 
 c. from about 0.5% to about 1.5% of ethylenediaminetetraacetic acid; 
 d. from about 0.3% to about 3% of an aromatic carboxylic acid chosen from benzoic acids, salts thereof, or mixtures thereof; 
 e. from about 0.25% to about 1.5% of a hydroxyacetophenone; 
 f. from about 0.1% to about 3% of a potassium sorbate; and 
 g. from about 4% to about 15% of at least one non-aromatic organic alpha hydroxy acids and salts thereof chosen from citric acid, lactic acid, and/or gluconic acid, wherein the solid article is an open cell pore structure; 
 wherein when the dissolvable article is dissolved with 20 part water to 1 part of the dissolvable article to form a dilution, the dilution comprises a pH of from about 3 to 5; 
 wherein the test dilution comprises a ≥2 log reduction at day 2, a ≥3 log reduction at Day 7, and a log reduction that is ≥ the log reduction at Day 7 at Day 28 for bacteria according to the MST Bacteria Result and the dilution comprises a ≥2 log reduction at day 14 and a log reduction that is ≥ the log reduction at Day 14 at Day 28 for yeast according to the MST Yeast Result. 
 
     
     
       2. The dissolvable solid article of  claim 1 , wherein the dilution comprises a pH of from about 3.8 to 4.95. 
     
     
       3. The dissolvable solid article of  claim 1 , wherein the dissolvable solid article is substantially free of heat sensitive ingredients which start to denature, decompose, and/or degrade at 50° C. or more. 
     
     
       4. The dissolvable solid article of  claim 1 , wherein the dissolvable solid article comprises two or more flexible, dissolvable, porous sheets. 
     
     
       5. The dissolvable solid article of  claim 1 , wherein the dissolvable solid article has a density ranging from about 0.050 g/cm 3  to about 0.380 g/cm 3 . 
     
     
       6. The dissolvable solid article of  claim 1 , wherein the dissolvable solid article comprises a Percent Open Cell Content of from about 80% to about 100%. 
     
     
       7. The dissolvable solid article of  claim 1 , wherein the surfactant system further comprises sodium lauroamphoacetate. 
     
     
       8. The dissolvable solid article of  claim 1 , wherein the article comprises greater than 0.3% to about 2.5% of the aromatic carboxylic acid. 
     
     
       9. The dissolvable solid article of  claim 1 , further comprising methylisothiazolinone and methylchloroisothiazolinone, wherein the article comprises 0.1% or less of the methylisothiazolinone and methylchloroisothiazolinone. 
     
     
       10. The dissolvable solid article of  claim 1 , wherein the composition comprises about 6% to about 12% of the at least one non-aromatic organic alpha hydroxy acids and salts thereof. 
     
     
       11. The dissolvable solid article of  claim 10 , wherein the at least one non-aromatic organic alpha hydroxy acids comprises citric acid.